CN202521160U - Composite pipe with polyurea coating - Google Patents

Abstract

The utility model relates to a composite pipe with a polyurea coating. The composite pipe comprises a metal pipeline, wherein a polyurea spraying layer is adhered to the inner wall or the outer wall of the metal pipeline. According to the composite pipe, the polyurea spraying layer integrates high physical performance, anti-corrosion performance and construction performance and is quick in curing; the flowing of the spraying layer of the pipeline during continuous spraying is avoided, the pipe descending time is short, the coating is not needed to be baked, and the production efficiency of operation on a production line is high; volatile organic matters are avoided, and the environment-friendly requirement is met; and the coating is compact, jointless, high in medium resistance, high in mechanical strength, large in adhesive force, wide in application range of temperature, high in dielectric strength and high in overcoatability of cathodic protection and is not easy to drop in the processes of carrying and hoisting, and on-site corrosion prevention at coated joints and welding positions of the pipeline can be realized.

Description

The polyurea coating composite pipe

Technical field

The utility model relates to metallic conduit, especially a kind of polyurea coating composite pipe.

Background technique

Pipeline outer wall is anticorrosion, the guard method of all adopting anticorrosive coat to combine with cathodic protection by national regulation requirement buried metal pipeline.Pipeline anticorrosion coating is the first road barrier, is directly connected to the antiseptic property and the service life of buried pipeline.Buried pipeline corrosion-inhibiting coating commonly used both at home and abroad at present mainly contains petroleum tar, coal-tar enamel, dissolving epoxy powder (FBE), double-deck dissolving epoxy powder, 3PE structural anticorrosion layer and SPUA etc.(1) petroleum tar is to use the longest historical anticorrosive paint, easy construction and easy repaired mouth, if anticorrosion environment does not have microorganism, no god takes root in thing, and a kind of economical and practical corrosion-inhibiting coating of still can yet be regarded as.Its major defect is that poor mechanical property, not UV resistant, and working life are short, and resistance to high temperature is not good enough yet.Heat petroleum tar not only inconvenience but also befouling environment at the construction field (site), replaced by other anticorrosive coat gradually because of the restriction that receives environmental protection in recent years.(2) coal tar enamel also is a kind of time-honored anti-corrosion material, has that bondability is good, moisture absorption is low, antimicrobial erosion, anti-plant roots and stems penetrate, long service life, advantage such as cheap.Major defect is that mechanical strength is low, serviceability temperature narrow range, brittle fracture under low temperature, high temperature trickling.Because this lacquer in production and using process, produces volatile carcinogen and the smell is awful, is eliminated gradually in recent years.(3) 3PE structural anticorrosion layer is the first-selected system of the outer corrosion-resistant of present European buried pipeline, and it has combined the advantage of high density polyethylene (HDPE) coating and clinkery epoxy powder.This system epoxy powder combines with steel tube surface firmly, utilizes the anti-mechanical deterioration of high density polyethylene (HDPE), two-layer between special glue-line make the three form the composite structure that molecular bond combines, thereby realized the good combination of antiseptic property, mechanical property.Its major defect has the following aspects: the repaired mouth problem of 3PE never solves, and can only adopt heat-contraction sleeve at present, and the bonding force of lap-joint is lower, abroad has been found that owing to heat-contraction sleeve is peeled off the situation that causes global failure; Form electrostatic shielding after the coating breakage easily, the effect of cathodic protection can not be brought into play well; Because the elbow shape and size are limit, anticorrosive coat and main pipe are inconsistent; Serviceability temperature is low.Pipelinerpiston is thought; Between the spreadable life of pipeline, the length in its life-span is relevant with the integrity that keeps anticorrosive coat with safety, should require main line pipe, circumferential weld, pipe fitting to adopt identical anticorrosive coat and quality assurance at interior whole piece pipeline; Adopt the pipeline of 3PE anticorrosive coat can not satisfy above-mentioned requirements; Although the main line pipe has adopted cathodic protection also can not play one's part to the full, these all are the hard defects of 3PE anticorrosive coat, still do not have better measure at present and solve the problems referred to above.(4) clinkery epoxy powder (FBE) and double-deck clinkery epoxy powder (double-deck FBE) have that adhesion is good, resistance to chemical attack, serviceability temperature are wide, with advantages such as cathodic protection is supporting, be that present north America region pipeline adopts one of more anticorrosive coat.Its major defect has the following aspects: the outside line poor performance, and easy efflorescence under solar radiation, physical property descends significantly; Damage resistant is relatively poor with the mechanical property that collides with, and in storage and handling process, damages easily; Owing to need heating plant, double-deck clinkery epoxy powder is very difficult to the processing of profiled pieces such as threeway, elbow; Repaired mouth and maintenance difficult.Repaired mouth adopts hot coating process, and hot coating process still adopts clinkery epoxy powder coating, but needs on-the-spot heating.Cold coating process is direct application of liquid epoxy resin, can not guarantee the conformity of anti-corrosion material.

When inner-walls of duct was anticorrosion, in accordance with international practices, diameter was main through pipeline with plastic tube less than the osculum of 800mm, in big mouthful be main with ductile iron pipe and steel pipe, super-large diameter is main with cement pipe.Steel pipe can use separately in can being widely used in supplying water, and also can be used with other tube material.But the overall cost of steel pipe supply line has limited its application.Adopt welding method in addition during the installation of steel pipe, increased the difficulty of aseptic technic.Advantages such as ductile iron pipe (abbreviation cast iron tube) has that tube wall is thin, good toughness, intensity are high, corrosion-resistant; Adopt flexible interface, easy construction, security of operation; Mechanical property is near steel pipe; And decay resistance is a most general in the world present pipe material for water supply near steel pipe, has been widely used in the conveying of town water supply, sewage, farmland irrigation water and piped gas.But reach the working life in 50 years, cast iron tube and steel pipe inwall must carry out preservative treatment, and method commonly used has liner slush and epoxy coating etc.Slush is a pipe lining with the longest history, still widely applies in the potable water industry at present, but has following problem greatly: it is easy to crack that stress shrinks the back, and surface imperfection (like pitted skin, sand cave, hollowing) is more; Cement-mortar lining can cause the raising of dissolved matter content, and hardness changes; NH3 separates out and causes the water quality alkalization; The unstability of water also can influence slush, when water at CO ₂Superequilibrium quantity concentration Gao Shihui causes that mortar is impaired, the grains of sand run off, influence water quality.

Summary of the invention

The purpose of the utility model provides a kind of polyurea coating composite pipe, solves the defective of original metallic conduit antiseptic property difference.

The purpose of the utility model realizes as follows: the polyurea coating composite pipe, comprise metallic conduit, and be attached with polyureas sprayfused coating (SPUA) at the inwall or the outer wall of metallic conduit.Outer wall needs the corrosion-resistant pipeline, is attached with the polyureas sprayfused coating at outer wall; Inwall needs the corrosion-resistant pipeline, is attached with the polyureas sprayfused coating at inwall.

The utility model has been broken traditional corrosion-inhibiting coating and need have been heated and twine the defective of bringing, and once the coating thickness of spraying can reach 1-2mm, and technology is simplified greatly.The polyureas sprayfused coating integrates excellent physical property, antiseptic property and workability, quick solidifying, and the continuous spraying of pipeline is not trickled, and the following pipe time is short, and coating does not need baking, and work production efficient is very high on production line; The non-volatility organic substance, compliance with environmental protection requirements; Coating densification, no seam, medium-resistance are very outstanding, can under strong corrosive environments such as marsh, pool, crude oil, cubic meter of stone district, use; Mechanical strength is high, carries, hangs difficult drop-off in the process; Adhesion is big, the adaptive temperature wide ranges, dielectric strength is high, and is good with the cathodic protection matching performance, can solve the on-the-spot anticorrosion of repaired mouth, pipeline welding place, be whole pipe anticorrosion in a most important step.Cast iron tube inner wall anti-corrosive adhesion is good, does not ftracture, and the complete rotary spraying device of a cover is adopted in spraying in the pipeline, and pipeline is at the uniform velocity rotation, and rotation is moved along diametric(al), thereby has guaranteed the homogeneity of coating thickness, and corrosion resistance is strong, long service life; Smooth surface, water conservancy friction power-assisted coefficient ratio concrete pipe and steel pipe are few, can improve emptying effectiveness, and under identical caliber condition, the power of saving pump and the energy reduce operation greatly and take more than 20%; Non-scaling, water quality can not produced secondary pollution by mushroom microbial contamination or the oxidation and rusting in the water, can keep permanent carrying capacity and clean water quality degree constant.

Description of drawings

Fig. 1 is the pipeline outer wall anticorrosion structure schematic representation of the utility model.

Fig. 2 is the inner-walls of duct anticorrosion structure schematic representation of the utility model.

Embodiment

With reference to Fig. 1, this polyurea coating composite pipe comprises metallic conduit 1, is attached with polyureas sprayfused coating 2 at the outer wall of metallic conduit 1.

With reference to Fig. 2, this polyurea coating composite pipe comprises metallic conduit 1, is attached with polyureas sprayfused coating 2 at the inwall of metallic conduit 1.

Claims (1)

1. a polyurea coating composite pipe comprises metallic conduit, it is characterized in that: inwall or outer wall at metallic conduit (1) are attached with polyureas sprayfused coating (2).

Images